condition mean min max ZT0-3 0.30973525 0.2932515 0.32621900000000004 ZT4-7 0.3261545 0.3261545 0.3261545 ZT8-11 0.2395385 0.2395385 0.2395385 ZT12-15 0 0 0 ZT16-19 0.2913925 0.2913925 0.2913925 ZT20-23 0.49867400000000006 0.49867400000000006 0.49867400000000006